[4] Both reduced the number of species from the 50-100 that had been accepted previously, and assigned most to being synonyms.
[5] Tanaka's 2001 Taxonomic revision of the family Cannaceae in the New World and Asia is one source of species names,[4] allied with the proposal to conserve the name Canna tuerckheimii over C.
[6] The most exhaustive work on Canna synonyms is that in the World Checklist of Selected Plant Families (WCSP).
[7] The following list is based on the Taxonomic revision of the family Cannaceae in the New World and Asia, by Tanaka[4] and the proposal to conserve the name Canna tuerckheimii over C.
[6][7] As of March 2020[update], the World Checklist of Selected Plant Families and Plants of the World Online regard many of these as synonyms (most of Canna indica) but also recognise two further species, making 12 in total.